For most travelers airline food went from “OK” to pretty much nothing over the past decade. However you should not complain about this, because Airlines are reeling from high energy costs, lower travel and the general global economic slowdown. Food is a good cost cutting area as it’s very expensive to serve a nice meal to everybody in-flight, and eating at the airport is no big deal, especially given the wider selection and relatively lower cost than what they need to add to a ticket price to feed you in the air.
So, stop complaining, buy a drink, and ask for a second on the peanuts. You just saved about 2-4% on the cost of your ticket.
Exceptions exist in first class and international flights such as this one on my Air France to CDG Paris where they sure know how to serve up a fine meal, complete with wine.